We know that Google is now going to be letting customers use Google Assistant's duplex technology to book appointments or make reservations on their behalf. With that, Michael Wallace posted on Twitter that one of his customers has a new section to enable or disable the ability for Google Assistant to call you to make these reservations.
Here is that screen shot, you can click on it to enlarge:
It reads, "Google Assistant calls. Let customers use the Google Assistant to book with you. Also, quickly update your listing by getting occasional calls to confirm your details." There is then a check box that says "Accept Google Assistant calls."
So if you do not want robots calling you, you can disable it. But I assume most people rather talk to robots over humans? :)
Forum discussion at Twitter.